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What does it mean if a backup is expired?（）
A:The backup set has exceeded the retention criteria set in RMAN and is eligible for removal. 
B:The backup set has one or more invalid blocks in it and is not usable for recovery. 
C:The backup set contains one or more tablespaces no longer in the database.  
D:The backup set contains one or more missing backup set pieces.
E:The backup set is from a previous version of RMAN and was not upgraded. 

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出自：Oracle认证

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